Hi friends, Im on my knees ! This problem has beaten me so far and ANY help/advice would be hugely appreciated.
I moved to a new indoor grow location some months ago for security reasons after 5+ years happily growing in my original place.
The intention was to grow out some new mothers and use the clones for my grow. The seeds Im using are C99 f1s and a cross of c99 x lavender which I created myself. I should point out that the seeds were created outdoors.
New room is 15 ft. x 20ft. Temps. are 25-26 deg. C. Humidity is about 50%. Co2 levels are about 1000ppm, dehumidifier working, fans circulating air. Ive outfitted the place with 6 x 1000w HPS, but am presently using a bank of 36W daylight acquarium flouros at 4300 lux each for seedlings with the intention to shift the seedlings under one of the HPS when they are 5-6 weeks old. Note that this is my second attempt to grow seedlings here; my first attempt produced plants that were so chlorotic that I dumped them after repeated attempts to cure them.
Right now Ive 20 new seedlings in 6 pots a couple of weeks old. The soil is virgin Atami janeco light mix NPK 12-14-24. On my previous attempt I used Atami kilo-mix, which is a hotter version of the light mix. The plants are being watered with ph adjusted water. No nutes added. Runoff is about 6.8 ph and EC is about 1.2 mS, a little high but o.k. nonetheless.
The new seedlings are beginning to show signs of leaf chlorosis, from about the third set of leaves. Im stumped. So what have I tried ?
- Chlorosis, to my knowledge, is caused by several things :
- A nutrient deficiency of either iron, magnesium or manganese. Ive added a plant tonic product last time round which contained chelated iron, mag., and mang. It didnt make any difference. And why should it ? New soil should have these elements.
- Were my plants overwatered ? No, I let them nearly dry out between waterings and water sinks quickly through the soil.
- Bugs in the soil ? No, checked soil and plant roots. Besides irksome fungus gnats there are no other bugs.
- Maybe I put them under the HPS too early ? Thats possible but then when I backed off the HPS to 4ft. away there was no improvement.
- Maybe the air in the room is bad ? Ive installed a powerful ventilation system which pumps air in 2 times per day for like, an hour each time.
Now heres the thing : I decided to take one of the sick plants outdoors. It stayed in the same pot, same soil, the only thing that changed therefore was light, air and water. After 2 weeks of hardening off, hey presto, the plant leapt to life and began to produce green leaves and grow normally.
And heres another thing : I have one of the original chlorotic plants still growing in the room. I kept it to see its evolution over time. Its now grown to three feet and all the new growth is chlorosis free ! WTF ? And here I am
Some pics below; you can see they are young plants and the chlorosis is obvious. And you may notice thats its not the normal interveinous chlorosis. The pattern is different; its like chlorophyll destruction.
Guys, if I could call in a pro I would, but for obvious reasons my eternal gratitude and whatever else I can offer will go to someone who can solve or help me solve this riddle. Its costing me big-time. Uncle Ben, ya out there ? I remember you from many years ago in other places. A true guru .
I moved to a new indoor grow location some months ago for security reasons after 5+ years happily growing in my original place.
The intention was to grow out some new mothers and use the clones for my grow. The seeds Im using are C99 f1s and a cross of c99 x lavender which I created myself. I should point out that the seeds were created outdoors.
New room is 15 ft. x 20ft. Temps. are 25-26 deg. C. Humidity is about 50%. Co2 levels are about 1000ppm, dehumidifier working, fans circulating air. Ive outfitted the place with 6 x 1000w HPS, but am presently using a bank of 36W daylight acquarium flouros at 4300 lux each for seedlings with the intention to shift the seedlings under one of the HPS when they are 5-6 weeks old. Note that this is my second attempt to grow seedlings here; my first attempt produced plants that were so chlorotic that I dumped them after repeated attempts to cure them.
Right now Ive 20 new seedlings in 6 pots a couple of weeks old. The soil is virgin Atami janeco light mix NPK 12-14-24. On my previous attempt I used Atami kilo-mix, which is a hotter version of the light mix. The plants are being watered with ph adjusted water. No nutes added. Runoff is about 6.8 ph and EC is about 1.2 mS, a little high but o.k. nonetheless.
The new seedlings are beginning to show signs of leaf chlorosis, from about the third set of leaves. Im stumped. So what have I tried ?
- Chlorosis, to my knowledge, is caused by several things :
- A nutrient deficiency of either iron, magnesium or manganese. Ive added a plant tonic product last time round which contained chelated iron, mag., and mang. It didnt make any difference. And why should it ? New soil should have these elements.
- Were my plants overwatered ? No, I let them nearly dry out between waterings and water sinks quickly through the soil.
- Bugs in the soil ? No, checked soil and plant roots. Besides irksome fungus gnats there are no other bugs.
- Maybe I put them under the HPS too early ? Thats possible but then when I backed off the HPS to 4ft. away there was no improvement.
- Maybe the air in the room is bad ? Ive installed a powerful ventilation system which pumps air in 2 times per day for like, an hour each time.
Now heres the thing : I decided to take one of the sick plants outdoors. It stayed in the same pot, same soil, the only thing that changed therefore was light, air and water. After 2 weeks of hardening off, hey presto, the plant leapt to life and began to produce green leaves and grow normally.
And heres another thing : I have one of the original chlorotic plants still growing in the room. I kept it to see its evolution over time. Its now grown to three feet and all the new growth is chlorosis free ! WTF ? And here I am
Some pics below; you can see they are young plants and the chlorosis is obvious. And you may notice thats its not the normal interveinous chlorosis. The pattern is different; its like chlorophyll destruction.
Guys, if I could call in a pro I would, but for obvious reasons my eternal gratitude and whatever else I can offer will go to someone who can solve or help me solve this riddle. Its costing me big-time. Uncle Ben, ya out there ? I remember you from many years ago in other places. A true guru .
